Putting mat



FIG. 1 is a front perspective view of a putting mat showing the claimed design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right-side elevational view thereof, the left-side elevational view being a mirror image thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a back elevational view thereof.

Broken lines in the figures show portions of the putting mat that form no part of the claimed design. The diagonal lines/hatching shown on the vertical sides of the putting mat represent the color green. 

CLAIM The ornamental design for a putting mat, as shown and described. 